package com.heima.admin.gateway.filter;

import com.heima.admin.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.log4j.Log4j2;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Log4j2
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取请求对象和响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();


        //2.判断当前的请求是否为登录，如果是，直接放行  localhost:6001/admin/api/v1/channel/list
        String path = request.getURI().getPath();
        if(path.contains("/login/in")){
            return chain.filter(exchange);
        }

        //3.获取当前用户的请求头jwt信息
        String token = request.getHeaders().getFirst("token");


        //4.判断当前令牌是否存在
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED); //设置响应的状态码 未授权  401
            return response.setComplete();// 不放行，直接响应
        }


        //5.如果令牌存在，解析jwt令牌，判断该令牌是否合法，如果不合法，则向客户端返回错误信息
            //5.1 合法，则向header中重新设置userId
            //重新设置token到header中
        //想客户端返回错误提示信息
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);//获取载荷

            int result = AppJwtUtil.verifyToken(claimsBody);//校验令牌  -1：有效，0：有效，1：过期，2：过期

            if(result==0 || result == -1){//有效的
                Object userId = claimsBody.get("id");
                log.info("find userId:{},from uri:{}",userId,request.getURI());

                //将用户id放入请求头中
                ServerHttpRequest requestHeader = request.mutate().headers(
                        httpHeaders -> httpHeaders.add("userId", userId.toString())
                ).build();

                //将重写构建的请求对象放入 exchange
                exchange.mutate().request(requestHeader).build();
            }
        }catch (Exception e){//jwt令牌有问题！！
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //6.放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置
     * 值越小，优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
